You have used a character that is not considered a "name character" in an attribute value. Which characters are considered "name characters" varies between the different document types, but a good rule of thumb is that unless the value contains only lower or upper case letters in the range a-z you must put quotation marks around the value.
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![]() | <body bgcolor="#ffffff"> |
Put double quotes around the value.
Unless you have extreme file size requirements it is a very good idea to always put quote marks around your attribute values.